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Macros are usually referred to as variables when they hold simple string definitions, like CC = clang. Macros in makefiles may be overridden in the command-line arguments passed to the Make utility. Environment variables are also available as macros. For example, the macro CC is frequently used in makefiles to refer to the location of a C ...
A file path is either enclosed in double quotes (i.e. "xyz.h") or angle brackets (i.e. <xyz.h>). [ 1 ] Some preprocessors locate the include file differently based on the enclosing delimiters; treating a path in double-quotes as relative to the including file and a path in angle brackets as located in one of the directories of the configured ...
An ELF file has two views: the program header shows the segments used at run time, whereas the section header lists the set of sections.. In computing, the Executable and Linkable Format [2] (ELF, formerly named Extensible Linking Format) is a common standard file format for executable files, object code, shared libraries, and core dumps.
CMake includes an interpreter for a relatively simple, custom, imperative scripting language that supports variables, string manipulation, arrays, function and macro declaration, and module inclusion (importing). The interpreter reads CMake language commands from files named CMakeLists.txt which specify source files and build preferences. CMake ...
If they are not specified in the Makefile, then they will be read from the environment, if present. Tools like autoconf's ./configure script will usually pick them up from the environment and write them into the generated Makefiles. Some package install scripts, like SDL, allow CFLAGS settings to override their normal settings (instead of ...
Automake contains the following commands: aclocal; automake; aclocal, however, is a general-purpose program that can be useful to autoconf users. The GNU Compiler Collection (GCC), for example, uses aclocal even though its makefile is hand written. Like Autoconf, Automake is not entirely backward compatible. For example, a project created with ...
Ninja is a build system developed by Evan Martin, [4] a Google employee. Ninja has a focus on speed and it differs from other build systems in two major respects: it is designed to have its input files generated by a higher-level build system, and it is designed to run builds as fast as possible.
For example, strings and arrays are passed by reference, but when modified, they are duplicated if they have non-zero reference counts. This allows them to act as value types without the performance problems of copying on assignment or making them immutable. [8] In the Qt framework, many types are copy-on-write ("implicitly shared" in Qt's terms).